Just an aside- a 65-67 B body 8 3/4 axle is a great upgrade, is literally a drop in (aside from drive shaft shortening), and actually puts the rear track almost exactly even with a disk brake front track.
planning on a Jeep Cherokee XJ rear end. car is a slant 6 and plan on keeping it that way, and the XJ rears are much easier to find around here than a nearly 60 year old B body housing.
